Sanding



March 7, 1939 s Mrrc 2,149,816

SANDING DRUM PAD Filed Dec. 9, 1957 Inventor A tiorneys accompanying drawing -iorming part Patented Mar. 7, 1939 UNITED STATES PATENT OFFICE SANDING nUM Pan Freeman S. Mitchell," San Diego, Calif. Application December 9 1937, Serial No. 178,997

7 Claims.

The present invention relates to sanding drum pads used on sanding machines and has for its primary object to provide a resilient rubber pad surrounding the drum beneath the sheet oisand i l vide a cooling attachment for sanding drums of this character which is efllcient and reliable in performance, relatively inexpensive to manufacture, which may be easily and quickly installed in operative position upon the drum and other- 1 l5 wise well adapted for the purposes for which the same is intended.

Further objects and advantages reside in the details of construction as more fully hereinafter described and claimed, reference being had to the hereof, wherein like numerals refer to like parts throughout and in which:

Figure 1 is an end elevational view of the cooling pad and rim for attaching to the. sanding -35 drum,

Figure 2 is a transverse sectional view through the pad and drum, and

Figure 3 is a fragmentary plan view of the pad showing the diagonal arrangement of the chan- 'm nels.

Referring now to the drawing in detail, the invention comprises a sheet metal rim 5 having its side edges provided with down-turned flanges 6 in which openings '1 are formedior receiving bolts or the like for securing the rim in position to a sanding drum of conventional construction, not shown).

A resilient rubber pad 8 is secured to the outer surface of the rim 6 by cementing, vulcanizing or in any other suitable manner, the outer surface of the pad being provided with alternate ribs 9 and channels it which extend diagonally across the outer surface of the pad, the channels. inwardly of the surface of the pad, being enlarged to provide passages ii of substantially round shape in cross section and corresponding- 1y forming the ribs 9 of substantially dove-tailed shape in cross section, as shown at i2.

The drum upon which the pad is mounted is intended to be rotated in the direction as shown by the arrow in Figure 1 of the drawing and the forwardly disposed end of the passages ii have their front edges notched as shown at l3 and the rear edges of the channels are provided withoutwardly projecting cups or vanes N to facilitate the entrance of air into the passages during the rotation oi the drum for the purpose of circulating the air transversely of the drum toward the opposite end of the passages.

line said opposite ends oi the passages have their leading edges provided with outwardly projecting cups or vanes i5 and the rear edges notched as shown at Hi to facilitate discharge of the air therefrom, said cups i5 further serving to form a vacuum adjacent the discharge end of the passages to facilitate the circulating of air through the same.

The sanding paper (not shown) is adapted tween the split ends ll of the rim.

to surround the pad with its ends clamped be- It is believed the details of construction and operation of the device will be readily understood from the foregoing without further detailed explanation. I

'Having thus described the invention what I claim is:-'

1. A sanding drum pad adapted for positioning between the drum and abrasive sheet carried thereby, said pad having air channels therein for cooling the underside of the abrasive sheet and means projecting from the ends of the channels for deflecting air into the channels.

2. A sanding drum pad adapted for positioning between the drum and abrasive sheet carried thereby, said pad having air channels in the surface thereof to provide contact for air with the underside of the sheet for cooling said sheet and cup-shaped deflectors projecting from the ends of the channels for deflecting air into'the channels.

3. A sanding drum pad adapted for positioning between the drum and abrasive sheet carried by the drum and spaced parallel air channels in the pad extending transversely thereof for cooling the underside of the abrasive sheet, said channels terminating at theends of the pad, one edge of each channel being flared to widen the entrance to the channel and means adjacent the flared edge of the channel for deflecting air into the channel.

4. A sanding drum pad adapted for positioning between the drum and abrasive sheet carried thereby, said pad having air channels therein for cooling the underside of the abrasive sheet, and means carried by the pad for deflecting air into said channels.

5. A sanding drum pad adapted for positioning between the drum and abrasive sheet carried thereby, said pad having air channels therein.

for cooling the underside of the abrasive sheet,

deflecting air into said channels and vacuum creating means at the opposite ends of said channels to accelerate discharge of air therefrom.

A pad for sanding drums comprising a resilient sheet of material, means for securing said sheet around the drum under an abrasive sheet carried by said drum and a plurality of air channels in the outer surface of said pad and extending diagonally thereof, one end of each of said channels constituting an -air intake end and the other end of'said channels constituting an air discharge and and means for accelerating the passage of air through said channels. I

7. A sanding drum pad adapted for positioning 2,149,816 o means at one end of each of said channels for between the drum and abrasive sheet carried thereby, said pad having air channels therein for cooling the underside of the abrasive sheet, means at one end of each of said channels for deflecting air into said channels and vacuum FREEMAN S. MITCHEIL. 

